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← AZ-900
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A company has multiple on-premises file servers that store user home directories and department shares. The company wants to migrate these file shares to Azure Files to eliminate on-premises server maintenance. However, users frequently access large files, and the company wants to cache the most frequently accessed files locally on a small Windows Server machine at each branch office to minimize latency and bandwidth usage. The company also wants a single unified namespace so users can access files using the same path regardless of whether the files are cached locally or stored in Azure. Which Azure service should the company use?

Question 1mediummultiple choice
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A company has multiple on-premises file servers that store user home directories and department shares. The company wants to migrate these file shares to Azure Files to eliminate on-premises server maintenance. However, users frequently access large files, and the company wants to cache the most frequently accessed files locally on a small Windows Server machine at each branch office to minimize latency and bandwidth usage. The company also wants a single unified namespace so users can access files using the same path regardless of whether the files are cached locally or stored in Azure. Which Azure service should the company use?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Distractor review

Azure Blob Storage with Azure Content Delivery Network (CDN)

Azure Blob Storage is an object storage solution, not a file share. Azure CDN can cache content at edge locations but does not provide a unified namespace for SMB file shares or support on-premises caching of file shares.

B

Best answer

Azure File Sync

Azure File Sync enables you to centralize file shares in Azure Files while maintaining the flexibility, performance, and compatibility of an on-premises file server. It provides cloud tiering to cache frequently accessed files locally and transparently recalls files from Azure on demand, offering a single namespace.

C

Distractor review

Azure Site Recovery

Azure Site Recovery is a disaster recovery service that orchestrates replication and failover of workloads, not a file synchronization or caching solution.

D

Distractor review

Azure Migrate

Azure Migrate is a service for discovering, assessing, and migrating on-premises servers, databases, and applications to Azure. It does not provide ongoing file caching or a unified namespace for file shares.

Common exam trap

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Technical deep dive

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

  • Static NAT maps one inside address to one outside address.
  • PAT allows many inside hosts to share one public address using ports.
  • Inside local and inside global describe the private and translated addresses.
  • NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

  • Identify inside and outside interfaces first.
  • Check whether the scenario needs static NAT, dynamic NAT or PAT.
  • Do not confuse NAT matching ACLs with normal packet-filtering intent.

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?

Question 2

A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)

Question 3

A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?

Question 4

A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?

Question 5

A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?

Question 6

A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?

FAQ

Questions learners often ask

What does this AZ-900 question test?

Static NAT maps one inside address to one outside address.

What is the correct answer to this question?

The correct answer is: Azure File Sync — Azure File Sync is the correct service because it centralizes file shares in Azure Files while enabling caching of frequently accessed files on on-premises Windows Servers. It provides cloud tiering, which keeps only the most recently used files locally and transparently recalls files from Azure when needed. This gives users a single namespace and optimizes bandwidth usage. Other options like Azure Blob Storage, Azure Site Recovery, or Azure Migrate do not offer local caching with a unified namespace for file shares.

What should I do if I get this AZ-900 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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